M5.6 earthquake 231 km SSE of Tabiauan, Philippines
A magnitude 5.6 earthquake struck 231 km SSE of Tabiauan, Philippines on Fri, Nov 11, 1983, 7:33 AM GMT+8 (23:33 UTC), 577 km (358 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1983-11-10 23:33:52 UTC
- Depth
- 576.5 km (358.2 mi), deep
- Epicenter
- 4.264° N, 123.024° E
- Region
- Philippines
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · 43 stations |
| 5.51 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.5 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
CENTROID, MOMENT TENSOR SOLUTION HARVARD EVENT-FILE NAME B111083A DATA USED: GDSN L.P. BODY WAVES: 11S, 19C, T=45 CENTROID LOCATION: ORIGIN TIME 23:33:55.0 0.6 LAT 4.22N 0.06;LON 123.17E 0.08 DEP 543.7 4.4;HALF-DURATION 2.1 MOMENT TENSOR; SCALE 10**24 D-CM MRR=-1.14 0.11; MTT=0.22 0.14 MFF=0.92 0.18; MRT=-0.97 0.16 MRF=-1.80 0.16; MTF=0.00 0.15 PRINCIPAL AXES: 1.(T) VAL=2.10;PLG=32;AZM=109 2.(N) 0.35; 7; 203 3.(P) -2.45; 57; 304 BEST DOUBLE COUPLE:M0=2.3*10**24 NP1:STRIKE=175;DIP=15;SLIP=-119 NP2:Strike=25;Dip=77;Slip=-83
From the USGS event page for usp0001zqd. U.S. Geological Survey text and figures are in the public domain.
Did you feel it?
No one has reported feeling this quake to the USGS.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.6 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001zqd (also filed as gcmtb111083a, gcmt19831110233352, iscgem564706). Read Fri, Oct 2, 2026, 12:33 AM UTC.